Jules ernest pallemaerts



2 FIRST ADHENE coHT 5 LEAD PAINT covmuvcf 1 ansa or SCREEN May 26, l931- J, E. PALLEMAERTS STEREOSCOPIC CINEMA PROJECTION SCREEN Filed Oct.

PYRAMIDS 5 Econo num-z5) VE conrll Patented May 26, 1931 UNITED STATES PATENT OFFICE STEREOSCOPIC CINEMA PROJECTION SCREEN Application 1e 1 October 1, 1928, Serial No. 309,382, and in Great Britain January` 21, 1928.

rl`his invention relates to cinema and like projection screens and has for its object the production of a screen which Will give the appearance of a third dimension, namely depth, or a stereoscopic effect, to the plcture projected thereon.

According to my invention the base of the screen is formed of a close texture material, such as linen or muslin, the back being coated with a lead paint to close the pores in the material.

The front of the screen is coated With'a transparent and colorless adhesive and on this adhesive are placed a number of glass pyramids to cover the whole front surface of the screen. The pyramids are preferably tetrahedral and made from clear crystal glass the sides being ground clear and polished. A second coating of the transparent adhesive is llowcd over a surface t such a depth as completely to embed the pyramids therein and give a smooth top surface to the screen. n

My invention is illustrated in the accompanying drawing, which is a sectional elevation of part of a. screen constructed in accordance therewith. l represents the linen or other base of the screen on which is placed a layer 2 of transparent adhesive. The pyra-l mids 3 are secured on this layer of adhesive 2, and a second coating 4 of the transparent adhesive is flowed thereover, so as to completely embed the pyramids therein. 5 represents the lead paint coating on the back of the base 1 to close the pores in the material.

The screen thus produced, gives the depth dimension to any object, moving or stationary, projected upon it, by the fact that the actual point of dead sharp focus is still on the fabric, having penetrated the glass, but the apexes of the pyramids being nearer to the projector lens are slightly out of focus thus producing a rounded effect to any object shown upon this screen, so that the picture projected on the screen is stereoscopic.

Brilliant illumination is obtainable on this screen, owing to the production of minute relected rays of light between the sides of the pyramids.

I claim:

l. A cinematograph and like projection screen comprising a fabric base, a transparent adhesive coating on the front of the fabric base, a plurality of glass pyramids placed on the adhesive coating With their apeXes projecting from the base, and a second coating of the transparent adhesive flowed over the front surface of the screen so as completely to embed the pyramids therein.

2. A cinematograph and like projection screen comprising a fabric base, a lead paint coating on the back of the said fabric base to close the pores in the material, a transparent adhesive coating on the front of the fabric base, a plurality of glass pyramids placed on the adhesive coating with their apexes projecting from the base, and a second coating of the transparent adhesive flowed over the front surface of the screen so as completely to embed the pyramids therein.

3. A cinematograph and like projection screen comprising a fabric base, a lead paint coating on the back of the said fabric base to close the pores in the material, a transparent adhesive coating on the front of the fabric base, a plurality of tetrahedral glass pyramids placed on the adhesive coating, and a second coating of the transparent adhesive flowed over the front surface of the screen so as completely to embed the pyramids therein.

In testimony whereof I have hereunto set my hand this 20th day of August, 1928.

JULES ERNEST PALLEMAERTS. 

